Food grinding mill



M. w. HARTMANN 2,243,476 FooD GRIND'ING MILL May 27, 1941-'.

iled Magen 9, 1940 @2kb/w m Patented May 27, 1941 UNITED STATESPATENT-OFFECE FOODI GRINDING MILL Milford W. Hartmann, Hutchinson, Kans.

Application March 9, 1940, Serial No. 323,178

4 Claims.

This invention relates to a food grinding mill and in particular to amachine for making pastelike products of nely ground solids in liquids.

An object of the invention is to provide a mill employing horizontalgrinding surfaces which may be easily disassembled as for cleaning, andreassembled, without altering the adjustment and alignment of the statorand rotor parts.

Another object is to provide a food mill having means for easily andquickly adjusting the distance between grinding surfaces while themachine is in operation.

Still another object is to provide a durable food grinding mill ofsimple and inexpensive construction.

These and other objects will be apparent from the description anddrawing in which:

Fig. 1 is an elevation, partly in section, showing one form of myinvention;

Fig. 2 is a cross-section taken on the line 2--2 of Fig. 1.

In the drawing, a cylindrical mill housing is mounted upon a support,such as the motor housing l2. The motor I3, having a vertical shaft I6,with a thrust bearing l5, drives the grinding member 26. The shaft I6extends through a partition 20 which forms the bottom wall of thecollecting chamber for the ground material. This bottom wall ispreferably sloping to drain the product to one side, to the dischargespout 2|. A packing gland 22 is provided to prevent leakage of thematerials down the shaft.

Upon the shaft I6 is mounted a rimmed table 24 having an overhangingcollar 25 over the top of the packing gland 22. On the table 24 withinthe rim is mounted a grinding member or stone 26 held in place by theange 28 and the nut 21 on the extension of the shaft I6. The grindingmember 26 is provided with a conical center portion 29 tapering down toan outer horizontal rim 3U which constitutes the actual milling surfaceof the rotor. The stationary grinding member or stone 32 hasa horizontalsurface facing the grinding surface 30 of the rotary member, and has atapered aperture whose surface 33 forms with the cone-shaped centerportion 29 of the rotor, a throat of gradually decreased opening to feedthe material between the grinding surfaces 30 and 3|. Coarse particlesmay be broken down in the throat.

The ring-shaped stator grinding stone 32 is mounted in a rimmed holder34 by the ring 35 and bolts 36 spaced at intervals around the stone. Theholder 34 is provided with a hollow conical hub 31 tapered to thecylindrical portion 38 through which is fed the mixture to be treated.The cylindrical portion 38 is threaded outside, and lits within thethreaded bushing 39 having a iiange 43 adjacent the under side of themill cover 4|. A handle 43 having a hubl 45 isl threadedly attached tothe outside of the upper end ofthe bushing 39, a key 44 being providedto prevent turning ofthe handle 43 on the collar or bushing 39. Thevertical position of the stator is adjustable by turning the handle 43and the threaded bushing 39 attached to it, the hub 45 ofthe handlebearing upon an upf-turned collar 43 in the center of the cover 4|. Thecover 4| is provided with an overturned edge 50 tting over the top edgeof the housing Il, and is removably held in place by hinged bolts 41 onthe housing Il, with nuts 43, fastening over the 'wings 49. o

The inside of the housing l, near the upper end is provided withtwobosses 53 disposed oppositely from a keyway 53 in which key 54 may bemoved in and out by the lock screw 55. The bosses 53 with the adjustablekey 54 form a three point means of centering the stationary stone holder34 with the drive shaft I6 and the rotary stone 26, while allowing it tobe also positioned vertically by means of the threaded sleeve 39 and thehandle 43. A clearance is provided between the stator rim and the insideof the housing, except at the bosses and key contacts, to prevent thedi'iculties of sticking together of the parts due to the nature ofthepasty material which is produced by the machine. When a stator rim ismachined to a close fit on its whole circumference with the housing,great diii'iculty has been encountered in disassembly after use, whichtrouble is avoided if a wider space is provided, as here.

In using a machine of this type, it is frequently necessary tothoroughly clean the interior,

and my structure provides means for doing thiseasily and quickly, andwithout disturbing the spacing of the grinding surfaces, nor the rotaryalignment of the parts. The head or cover 4|, holding the stationarystone holder 31 and the stone 32 may be removed simply by releasing thekey 54 by turning the lock screw 55, and by loosening and disengagingthe hinged bolts 41 from the wings 49. After cleaning, the cover andstationary stone may be replaced and immediately aligned by putting therim of the holderY 31 against the two fixed bosses 53, and locking thekey 54 against the opposite side, and then bolting the cover 4| to themain housing by means of the hinged bolts 41. Material to be ground isfed to the mill through the opening 56 which may be threaded forattachment to a feed pipe or hose, the mixture of liquid and solidmaterial being milled or intimately mixed or emulsied by passage betweenthe stones, and the product discharged from the spout 2l.

While abrasive grinding stones and wheels are preferred in my mill, itwill be apparent that other disk type grinding surfaces may be usedincluding plain .or roughened metal surfaces.

By providing for the vertical adjustment of the stationary grindingsurface, the rotating parts may be permanently aligned in the bearings,and

then are not subject to Vibration and consequent While I have describedand shown a preferred form of my invention, I do not wish to limitmyself to the details of this form, and restrict the scope of myinvention only insofar as required by theprior art and the spirit `ofthe appended claims.

I claim: y

1. A horizontal disk Vtype grinding mill comprising a housing having itsupper interior portion cylindrical in section and having a partitionwall below the grinding members, a rotatable grinding disk having ahorizontal grinding surface and an upstanding conical Vcenter portion atxed elevation journaled in said wall, a remov- .aiblercover for saidhousing, a holder carrying a stationary grinding disksupported by saidcover adapted to fit within the cylindrical portion of said housing,means for feeding material to the center of and between said grindingdisks, an apertured grinding disk in said holder, means Aassociated withsaid feeding means for vertical adjustment of said stationary disk,non-adjustable bosses on the interior cylindrical portion of saidhousing for aligning the holder, and a movable Vkey means opposite saidbosses for holding said `holder against said bosses.

2. A horizontal disk type grinding mill comprising a housing having itsupper interior portion cylindrical in section and having a partitionwall below the grinding members, a rotatable grinding disk at fixedelevation journaled in said partition wall, a removable cover for saidhousing apertured for an extension of a. stationary disk holder, aholder for a stationary grinding disk adapted to t within thecylindrical portion of said housing and having a hollow threadedextension through said cover, a threaded bushing thereon having a collaron the underside of said cover, a handle attached to the other end ofsaid bushing for turning the same, means including said hollow extensionfor flowing material from the center between the grinding members, acenter apertured stationary grinding disk attached on said holder, twobosses on the interior cylindrical portion of said housing adapted toabut said holder, and a removable key means Vopposite* said bosses forholding said holder ,against said bosses.

3. In a horizontal disk ty-pe grinding mill in a housing having aremovable cover upon which ismounted a vertically adjustable holder forthe ,stationary disk, means for replaceably aligning said holder withthe ho-using, said aligning means consisting of fixed bosses on theinside of said housing against which said holder may be positioned, amovable key disposed opposite said bosses, and set-screw means in thehousing for pressing said key against said holder.

4. A-grinding mill comprising a housing having its upper interiorportion cylindrical in section and having a partition wall ibelow thegrinding members, a grinding disk journaled in said wall at a xedelevation, said grinding disk having a central conical grinding portionupstanding from a horizontal grinding surface, a removable cover forsaid housing, a holder for a stationary grinding :disk adapted to fitwithin the cylindrical portion of said housing, Va grinding disk in saidholder provided with a truncated conical center opening adapted .to formwith the conical center portion of the rotary disk an annular throat oftapered cross-section leading to the space between the horizontalgrinding surfaces of the grinding disks, a tubular means supporting saidstationary disk holder communicating with the outside of the mill andadapted for the introduction therethrough of the feed material to thecenter portion of the grinding disks, fixed bosses on the interiorcylindrical port-ion of said housing for aligning the holder andcentering the disks, and means opposite said bosses for holding saidholder against the bosses.

MILFORD W. HARTMANN.

